Its a giant shock absorber for bridges. It is usually attached in the area of the substructure, between the sofit and the abutment wall. Its primary job is to minimizes movement during seismic activity. I am a bridge maintenance supervisor in California and I have only seen them on longer bridge spans.
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Seismic dampers are devices used in building construction to protect the buildings against earthquake and other seismic events.
To 'damp' vibrations in the conductors.
Micro VAV are VAV dampers from Micro Matic.
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